Lamp.



W MyW/00D.

LAMP.

MPL10/num HLED APR. 19. me,

Ehrtcned Nm 5, 1918 2 SHEETS-SHEET l.

Fig Ef.

INVENTOR. WH W0 UD.

A TTORNEYS.

convergin? .nient t te wht source 1s located at the focal poin; 5 of theparabola in the. ver ical plane of the axis behind the focal point ofthe larger parabola in the horizontal plane of the axis and in tactbehind all intermediate focal dpointe of the paraboles involved 1n theelliptical Jformation. I

By placing the two body pcrtions'in an guiar relations a triangularspace. is produced at each aide of the axis .which is filled im. by letSections 7, and in making the nper and lower body portionssemi-elliptical in cross section and arranging them in angular relationsand llin in the triangulaispace the complete boeg' appears to beaproximatel y round viewed from the front.- glie reflector described isdesigned to utilize an electric lamp in which the light einanates from arestricted arca approximating a point, but a somewhat similar beam anddit fusion of light may oe obtained by a reiector and lamp constructedand arranged as disclosed in Figs. 5 to t5. Thus, in Fiffs. 5 and 6, lshow a parabolic reflector 8 ortho ordinary kind in which the focus islocated approximately at point i). By employing an electric lamp havingan extended line ol light and arranging' the lamp to place this extendedline olf light at an angle and in intcrsectiug relations with the focusl the terminals l() and ll of the line oi light may be placed at equaldistances in advance of and behind the focus .l and also at equaldistant-,es above and helow the axis. rlfhe result in the vertical planeof the axis is this: that thc rays from the linear source ol" light arern'ojerted trom the upper portion of the re eetor on lines approximatelyparallel with the axis, while the rays from the saine source areln'ojected from the lower portion of the reflector at varying angles tothe axis, that is, the light is dii fused. A source of light emanatingfrom the axis ahead oil the focus cmiverges the rays and terminal 1l islaced in advance in this way in Fig. .5, but it must he noted also thatit is `below the axis as well and in offset relation to focus l) therehyreetilyino, the convergence and causing the rays from this extendedpoint to parallel the angle of deflect1on ofthe ray 0l light from focalpoint 9. The opposite tern'iinal l0 of the source of light is behindfocal point 9 and ordinarily the rays of light would diverge under thiscondition, out this terminal point 10 is also ofl'set, only it is placedabove the axis and relatively nearer the upper parabolic surface,thereby effecting the saine result as the front oilsct ll, that is, thera y ot' light therefrom is projected at the saine or substantially thesaine angle olf deflection as the ray from the focal point il, Anentirely dillcrent result occurs in the lower portion oit the reflector,that is, the divcrginf; and convoi-gin rays of light due to the retiredand adrancex points of light l0 and 1l are. not corrected but areenhanced because the rear point 10 is above the axis and farther removedfrom the lower parabolic. surface, and the front )oint 1l is nearer tosaid lower parabolic sur ace and beneath the axis. Briefly, a diffusedlight obtained from the lower half of the rcilector, and to utilize thisdistribution of light to the liest advantage, the saine steps may hetaken as in the other form oiu my invention, that is, the lower por tionof the reflector may be arranged at un angle to the lippe' and anelliptical shape "ivcn to the reflector in Cross section.y sce "ias, 7and 8. n addition, the electric lamp might he moved forward to place theiinc of light ahead of the focal pour.y ll so that prac tieally all thelight will he directed hclow the horizontal axis the-lamp.

.Vhat l claim is:

l. in a lamp, a reilector of parai'iolicfornl having a plain sn'ioothreflecting surface ahove its horizontal axis and a multiple ot iiatlight-diffusing surfaces beneath said axis.

Q. In a lamp, a reflector haring on one side olA its axis n paraholoidsurface and on the other side oit its axis multiple o'i flat eoextensivereflecting` surfaces approximating a parabolic curve.

Il. l'n a lamp, a reflector having a plain smooth parabolic relief-.tiraportion and a surface opposed thereto su -dividcd into a multiple otco-extensive fiat reiectiin;r planes whose normals intersect theparabolic exis.

4. l'n a lainpkna reflector of parabolic form laavingY above itshorizontal airis a plain smooth reflecting surface and below said axis amultiple of i'iat light diffusing' sur-- faces whose normals intersectsaid axis.

5. ln a lamp, a reflector haring at one side ol' .its axis a lightfocusing surface and at the other side a light dinusing and pro- ]ectmgsurface.

6. ln a lamp, f ellector havin a parabolic reflecting portion on oneside oi" its center and drawn ahorita given axis and a multiple of flatreflectingr surfaces of graduated size upon the other side of its centerextending radially therefrom on parabolic lines, drawn about an axisslightly divcrgg ing from said first axis. i'

7. In a lamp, a rellector having a smooth parabolic reflecting surfaceand a reflecting surface Situated opposite thereto subdivided radiallyinto a. multiple oi flat planes extending on straight lines which moeton parliiioeioio air of opposed semi-elliptic perolioloizie nving aplain smooth reflecting eurtece alcove its horizontal exis emol omrlltiple ot fiat light. di'using surfaces beneath seid axis.

10. ln a, lamp, e reHeotor in the form oi a Jair of opposedSemi-elliptic poreboloirle 'arranged with "theiry greatest diameters imthe horizontal plane through its ortis :incl the lower segment beingeublivifiocl into Het li 'ht-diusing surfaces.

l1. n a lamp a reflector ol paroloolic form having e plein smoothreflecting' sur :tace above its horizontal axis :incl e portion vinclined relatively to seid axis liziviiig e multiple of Hetlight-diffusing surfaces belieetli said exis.

l2. lin e lamp, e, reflector wherein all eeetione' parallel to the exiscontain. seroi-perou bolic segments having progressively verging focalipoints so related that every 'section transverse to the exis constitutese portion of ali ellipse, :will a lineair light source obliquelyolieposedto seid exis in tlie plone of the smallest parabole..

'13. lu o lomp o pair of reflector portiere oit elliptical emi parabolictormetiori clit poeed with their etes in singolo-r relationL endl one otSeidl portions hoving'e multiple of liet reflecting eurleoee.

semi,ellipt1e petrolio lll:

lfii e lmnpj rellector limiet; ii pero@ oloirl portieri, itieoiiiliiioetioii iritli it lineair eoliree eirtciiolirlg through tliesirio oi mieli portion to firllietoiitioll Y roiliorro olieterieee oiloppoeitesiriee tliereol erifl. irieliioeol relotirely to tlifit .atri-e.i

l5 lili heed light, ii. porel'iolio reilector io. `coroloiiiiitioio,with mi electric Aiiglit lila merit intersecting; the perebolie eirioend in oliiieel relatively thereto et oblique angle.

lll. llii e lieeolliglit, :i rei'leotor looting e poreloolio portierierroiiigfetl with its exis horizontal iii oomliiii-etioio. with e linearlight sottrae ii'itereeetiogi,P tlie poreliolic exis amil iiicliiieclrelatively tliereto, solei light eoorce loe/ingr wholly ooiitoiiieclilo. e Vertieel plone emi eine; iiicliiieii ilowiirrerrliy from roer toliront.

lit. ll'n e lomp, e. retlecl-or limiet; oppor sind lower rel-lootingeorleoee oir' peroloolic vloi-m eet Willi their mies iii enigerlei*reletioiie, iii ooiiiloiiietioii with iiy lirie ofl light extending'ltliroiirrli orio ortie moll inclined relati rely tliereton Y i lll.l'ii o, lioeol ligrlitE at rotleetor lier/img upper etici lowerretleetiriii; 'eiirileeeeoll eemiperelooloicl torio eet with tlieir eroedit/er img' torworclly iii eoiiiliiinotioii-Witli ai lineair lightsource intereeetiiig tlie :mis of the i1pper poritluoloirl orirlincliiierl relatively thereto, tlie direction oil elicli iocliiietioi beiii olowiermrrily .trom roer to iront.

llii testimony 'Wliereoii ll elitair my signature iii presence ot' twowitiieeeeti lllllltillilllllllfll tll'llUll. liiitrieesee:

